// Copyright (c) 2023 Huawei Technologies Co., Ltd
// All rights reserved.
//
// Licensed under the BSD 3-Clause License  (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://opensource.org/licenses/BSD-3-Clause
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#include "op_plugin/AclOpsInterface.h"
#include "op_plugin/utils/OpAdapter.h"

namespace acl_op {
using npu_preparation = at_npu::native::OpPreparation;
using npu_utils = at_npu::native::NpuUtils;

namespace {
at::Tensor& softshrink_out_nocheck(
    at::Tensor& result,
    const at::Tensor& self,
    at::Scalar lambd)
{
    at_npu::native::OpCommand cmd;
    cmd.Name("SoftShrink")
        .Input(self)
        .Output(result)
        .Attr("lambd", lambd)
        .Run();

    return result;
}
} // namespace

at::Tensor& softshrink_out(
    const at::Tensor& self,
    const at::Scalar& lambd,
    at::Tensor& result)
{
    TORCH_CHECK(lambd.toFloat() >= 0, "lambd should be greater or equal to 0" + OPS_ERROR(ErrCode::VALUE));
    npu_preparation::CheckOut(
        {self},
        result,
        self);

    if (!npu_utils::check_match(&result)) {
        at::Tensor contiguous_result = npu_utils::format_contiguous(result);
        softshrink_out_nocheck(contiguous_result, self, lambd);
        npu_utils::format_fresh_view(result, contiguous_result);
    } else {
        softshrink_out_nocheck(result, self, lambd);
    }

    return result;
}

at::Tensor softshrink(const at::Tensor& self, const at::Scalar& lambd)
{
    TORCH_CHECK(lambd.toFloat() >= 0, "lambd should be greater or equal to 0" + OPS_ERROR(ErrCode::VALUE));
    at::Tensor result = npu_preparation::apply_tensor(self);

    softshrink_out_nocheck(result, self, lambd);

    return result;
}
} // namespace acl_op